Found in a 90’s Radio Electronics, this circuit uses a component from the time, difficult to find today. It generates 12 tones in different octaves.
This touch switch is from a 1978 publication. The circuit should not be powered by a...
A fourth version of a non-retriggerable monostable is shown in Figure. It is triggered by the...
Found in a 90's EDN, this circuit provides a current of a few tens of mA. The circuit can generate 15...